package backtype.storm.utils;

import org.apache.thrift7.TException;
import org.apache.thrift7.protocol.TBinaryProtocol;
import org.apache.thrift7.transport.TFramedTransport;
import org.apache.thrift7.transport.TSocket;
import org.apache.thrift7.transport.TTransport;

import backtype.storm.generated.DRPCExecutionException;
import backtype.storm.generated.DistributedRPC;

public class DRPCClient implements DistributedRPC.Iface {
	private TTransport conn;
	private DistributedRPC.Client client;
	private String host;
	private int port;
	private Integer timeout;

	public DRPCClient(String host, int port, Integer timeout) {
		try {
			this.host = host;
			this.port = port;
			this.timeout = timeout;
			connect();
		} catch (TException e) {
			throw new RuntimeException(e);
		}
	}

	public DRPCClient(String host, int port) {
		this(host, port, null);
	}

	private void connect() throws TException {
		TSocket socket = new TSocket(host, port);
		if (timeout != null) {
			socket.setTimeout(timeout);
		}
		conn = new TFramedTransport(socket);
		client = new DistributedRPC.Client(new TBinaryProtocol(conn));
		conn.open();
	}

	public String getHost() {
		return host;
	}

	public int getPort() {
		return port;
	}

	public String execute(String func, String args) throws TException,
			DRPCExecutionException {
		try {
			if (client == null)
				connect();
			return client.execute(func, args);
		} catch (TException e) {
			client = null;
			throw e;
		} catch (DRPCExecutionException e) {
			client = null;
			throw e;
		}
	}

	public void close() {
		conn.close();
	}
}
